It would seem that Mr Khan was admonishing someone off-scene as he strode along.
Perhaps the waiting phalanx of photographers simply took Mr Khan by surprise - he wasn't the only actor at the airport on Monday, as these pictures show:
In May, this picture of Mr Khan looking noticeably heavier than he used to on screen appeared on social media and soon after, Twitter trolled him mercilessly for his weight gain.
On an unverified Facebook page, Fardeen Khan addressed trolls in a strongly-worded post in which he wrote that he was not 'ashamed, shamed, offended, depressed or blind.'
Fardeen Khan, son of veteran actor Feroz Khan, made his Bollywood debut in 1998 with Prem Aggan. He is the star of films like Jungle, Pyaar Tune Kya Kiya, Om Jai Jagadish, Khushi and Fida. Fardeen Khan was last seen in 2010's Dulha Mil Gaya.